removed hhvm from travis.yml
removed hhvm from travis.yml

kimausloos/image,youthoughts/image,ChineseDron/image,blackmamba85/image,rikless/image,nhahv/image,gdseller/image,anomalylabs/image,Lowry0207/image,misaniuk/image,Shengs/image,mubassirhayat/image,stephandesouza/image,janusnic/image,Intervention/image,mikeSimonson/image